Before the advent of Insulated Glazed Units, glass was a simple material; it came roughly all in the same thickness and was easily fitted to the sashes using putty.  Big sheets of glass were more expensive than little ones so sashes were often divided into numerous ‘lights’ by placing glazing bars at regular intervals.  Glass tended to be more brittle than today and less consistent in its composition.  As a building material, it was remarkable in two ways:  it was fragile and not very good at keeping out the cold.

GlassTimes have moved on and even single sheets of glass can be engineered in ways that a 19th Century glass-blower would have marvelled at – it is fair to say that, nowadays, glass is an engineered product with a bewildering range of features and specifications available.  Add to this the numerous methods of forming an insulated glazing package, the range of spacers available and the types of inert gases that can also be defined to minimise heat transfer and we have a recipe for confusion….

You might already have met a number of window dealers who speak at length with confidence on the comparative benefits of various ‘uValues’, package compositions, cavity treatments and other such knowledgeable topics…

We are proud to announce that we are not part of this ever-expanding trend in UK window sales:  we are a design-led joinery manufacturer first and foremost, glass is a major part of the products we offer but it is incorporated as part of the whole to achieve a lastingly beautiful result.  We wish to produce windows that are as aesthetically close to the originals as is practically possible.  Deep glazing units require ‘fat’ joinery to accommodate them; this neither looks authentic nor leads to a frame that will fit into the hole left by the original, leading to further disruption…

  • The standard glazing package we offer has a combination of features which balance thermal performance with traditional sash joinery which, for all intents and purposes, will look the same as the architect originally intended.
  • Your planning authority might have a maximum uValue guideline for replacement windows in your area, our standard package achieves an approximate centre-pane (Ug) value of 1.24w/m2K:  it is probably wise to run this by building control regulators if you are at all unsure.
  • We can modify the glass packages (and the joinery) to practically any specification you might require to get the perfect window-style for your project; this might include toughened or laminated panes, solar or acoustic resistant or obscure glass. Glazing bars, ‘exotic’ gas-filled cavities, etc.,Some packages are available as ‘standard options’ whilst others must be priced separately.
  • The more options that you select will, understandably, lead to a higher price; also, certain configurations take longer to arrange and might lead to a slightly longer lead time for delivery.
  • There are regulations which, quite sensibly, dictate where certain types of glass can be specified, we will be happy to provide advice and guidance should you need it.

GlassWe care passionately that your window will perform its function well and provide you with a comfortable and attractive home for years to come. 

We feel we can provide these things by designing and making beautiful versions of a classically British form of joinery with all modern conveniences. We won’t blind you with technical jargon, but, if you would like to see the upgrades available to you, click into the options area.

Timber Windows

Butler & Bowler windows maintain the aesthetic of a traditional window manufacture with the benefits of innovative design and incorporating modern technology. Maintenance is a breeze.

Wooden Doors

Timber Doors

Butler & Bowler uses the latest door manufacturing technology that allows our products design versatility and optimum performance.


Bespoke Joinery

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